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package partition_table_sun;
use diagnostics;
use strict;
use vars qw(@ISA);
@ISA = qw(partition_table_raw);
use common qw(:common :system :file :functional);
use partition_table_raw;
use partition_table;
use c;
#- very bad and rough handling :(
my %typeToDos = (
5 => 0,
);
my %typeFromDos = reverse %typeToDos;
my ($main_format, $main_fields) = list2kv(
a128 => 'info',
a14 => 'spare0',
a32 => 'infos',
a246 => 'spare1',
n => 'rspeed',
n => 'pcylcount',
n => 'sparecyl',
a4 => 'spare2',
n => 'ilfact',
n => 'ncyl',
n => 'nacyl',
n => 'ntrks',
n => 'nsect',
a4 => 'spare3',
a64 => 'partitions',
n => 'magic',
n => 'csum',
);
$main_format = join '', @$main_format;
my ($fields1, $fields2) = ([ qw(type flags) ], [ qw(start_cylinder size) ]);
my ($format1, $format2) = ("x C x C", "N N");
my ($size1, $size2) = map { psizeof($_) } ($format1, $format2);
my $magic = 0xDABE;
my $nb_primary = 8;
my $offset = 0;
sub adjustStart($$) {
my ($hd, $part) = @_;
my $end = $part->{start} + $part->{size};
#- since partition must always start on cylinders boundaries on sparc,
#- note that if start sector is on the first cylinder, it is adjusted
#- to 0 and it is valid, maybe not in fact, problem with Sun disk label.
#- IT COULD HURT IF STARTING AT 0, MAYBE THERE ARE SOME FLAGS FOR EXT2
#- TO AVOID WRITING ANYTHING ON THE FIRST 1024 BYTES OF DISK, ELSE PROM
#- MAY ERASE EVERYTHING... TO BE CHECKED LATER.
#- so now, starting on cylinder 1 is perfect altough it waste some disk space !
$part->{start} = round_down($part->{start}, $hd->cylinder_size());
$part->{start} = $hd->cylinder_size() if $part->{start} == 0;
$part->{size} = $end - $part->{start};
$part->{size} = $hd->cylinder_size() if $part->{size} <= 0;
}
sub adjustEnd($$) {
my ($hd, $part) = @_;
my $end = $part->{start} + $part->{size};
my $end2 = round_up($end, $hd->cylinder_size());
$end2 = $hd->{geom}{cylinders} * $hd->cylinder_size() if $end2 > $hd->{geom}{cylinders} * $hd->cylinder_size();
$part->{size} = $end2 - $part->{start};
}
#- compute crc checksum used for Sun Label partition, expect
#- $tmp to be the 512 bytes buffer to be read/written to MBR.
sub compute_crc($) {
my ($tmp) = @_;
my @l2b = unpack "n256", $tmp;
my $crc = 0;
map { $crc ^= $_ } @l2b;
$crc;
}
sub read($$) {
my ($hd, $sector) = @_;
my $tmp;
local *F; partition_table_raw::openit($hd, *F) or die "failed to open device";
c::lseek_sector(fileno(F), $sector, $offset) or die "reading of partition in sector $sector failed";
sysread F, $tmp, psizeof($main_format) or die "error while reading partition table in sector $sector";
my %info; @info{@$main_fields} = unpack $main_format, $tmp;
#- check magic number
$info{magic} == $magic or die "bad magic number";
#- check crc, csum contains the crc so result should be 0.
compute_crc($tmp) == 0 or die "bad checksum";
@{$hd->{geom}}{qw(cylinders heads sectors)} = @info{qw(ncyl nsect ntrks)};
my @pt = mapn {
my %h;
@h{@$fields1} = unpack $format1, $_[0];
@h{@$fields2} = unpack $format2, $_[1];
$h{start} = $sector + $h{start_cylinder} * $hd->cylinder_size();
# $h{type} = $typeToDos{$h{type}} || $h{type}; #- for rewrite it ?
$h{size} or $h{$_} = 0 foreach keys %h;
\%h;
} [ $info{infos} =~ /(.{$size1})/g ], [ $info{partitions} =~ /(.{$size2})/g ];
[ @pt ], \%info;
}
# write the partition table (and extended ones)
# for each entry, it uses fields: start, size, type, active
sub write($$$;$) {
my ($hd, $sector, $pt, $info) = @_;
# my ($csize, $wdsize) = (0, 0);
#- handle testing for writing partition table on file only!
local *F;
if ($::testing) {
my $file = "/tmp/partition_table_$hd->{device}";
open F, ">$file" or die "error opening test file $file";
} else {
partition_table_raw::openit($hd, *F, 2) or die "error opening device $hd->{device} for writing";
c::lseek_sector(fileno(F), $sector, $offset) or return 0;
}
($info->{infos}, $info->{partitions}) = map { join '', @$_ } list2kv map {
$_->{start} % $hd->cylinder_size() == 0 or die "partition not at beginning of cylinder";
# $csize += $_->{size} if $_->{type} != 5;
# $wdsize += $_->{size} if $_->{type} == 5;
$_->{flags} |= 0x10 if $_->{mntpoint} eq '/';
$_->{flags} |= 0x01 if partition_table::isSwap($_);
# local $_->{type} = $typeFromDos{$_->{type}} || $_->{type};
local $_->{start_cylinder} = $_->{start} / $hd->cylinder_size() - $sector;
pack($format1, @$_{@$fields1}), pack($format2, @$_{@$fields2});
} @$pt;
# $csize == $wdsize or die "partitions are not using whole disk space";
#- compute the checksum by building the buffer to write and call compute_crc.
#- set csum to 0 so compute_crc will give the right csum value.
$info->{csum} = 0;
$info->{csum} = compute_crc(pack($main_format, @$info{@$main_fields}));
syswrite F, pack($main_format, @$info{@$main_fields}), psizeof($main_format) or return 0;
sync();
1;
}
sub info {
my ($hd) = @_;
#- take care of reduction of the number of cylinders, avoid loop of reduction!
unless ($hd->{geom}{totalcylinders} > $hd->{geom}{cylinders}) {
$hd->{geom}{totalcylinders} = $hd->{geom}{cylinders};
$hd->{geom}{cylinders} -= 2;
#- rebuild some constants according to number of cylinders.
$hd->{totalsectors} = $hd->{geom}{heads} * $hd->{geom}{sectors} * $hd->{geom}{cylinders};
}
#- build a default suitable partition table,
#- checksum will be built when writing on disk.
#- note third partition is ALWAYS of type Whole disk.
my $info = {
info => "DiskDrake partition table",
rspeed => 5400,
pcylcount => $hd->{geom}{totalcylinders},
sparecyl => 0,
ilfact => 1,
ncyl => $hd->{geom}{cylinders},
nacyl => $hd->{geom}{totalcylinders} - $hd->{geom}{cylinders},
ntrks => $hd->{geom}{heads},
nsect => $hd->{geom}{sectors},
magic => $magic,
};
$info;
}
sub clear_raw {
my ($hd) = @_;
my $pt = { raw => [ ({}) x $nb_primary ], info => info($hd) };
#- handle special case for partition 2 which is whole disk.
$pt->{raw}[2] = {
type => 5, #- the whole disk type.
flags => 0,
start_cylinder => 0,
size => $hd->{geom}{cylinders} * $hd->cylinder_size(),
};
$pt;
}
1;
|
